The role of lasers in reading a compact disc has to be explained. Concept introduction: When light of certain wavelength falls on ruby crystal (aluminum oxide contains small amount of chromium(III) ions), the chromium ions undergo transition from level one to level three . Most of Cr 3+ ions in level three undergo radiation less transition to level two by losing energy in form of heat than emitting photons. Level two has much greater lifetime which leads to accumulation of Cr 3+ ions in level three. When these accumulated ions emit all at same time an intense emission will occur. The wavelength of photon from emitted ion and original photon are same. Now there are two photons one original photon and another by stimulated emission. Finally there is increase in intensity of light at this wavelength.
The role of lasers in reading a compact disc has to be explained. Concept introduction: When light of certain wavelength falls on ruby crystal (aluminum oxide contains small amount of chromium(III) ions), the chromium ions undergo transition from level one to level three . Most of Cr 3+ ions in level three undergo radiation less transition to level two by losing energy in form of heat than emitting photons. Level two has much greater lifetime which leads to accumulation of Cr 3+ ions in level three. When these accumulated ions emit all at same time an intense emission will occur. The wavelength of photon from emitted ion and original photon are same. Now there are two photons one original photon and another by stimulated emission. Finally there is increase in intensity of light at this wavelength.
Solution Summary: The author explains the role of lasers in reading a compact disc.
The role of lasers in reading a compact disc has to be explained.
Concept introduction:
When light of certain wavelength falls on ruby crystal (aluminum oxide contains small amount of chromium(III) ions), the chromium ions undergo transition from level one to level three . Most of Cr3+ ions in level three undergo radiation less transition to level two by losing energy in form of heat than emitting photons. Level two has much greater lifetime which leads to accumulation of Cr3+ ions in level three. When these accumulated ions emit all at same time an intense emission will occur. The wavelength of photon from emitted ion and original photon are same. Now there are two photons one original photon and another by stimulated emission. Finally there is increase in intensity of light at this wavelength.
Highlight each glycosidic bond in the molecule below. Then answer the questions in the table under the drawing area.
HO-
HO-
-0
OH
OH
HO
NG
HO-
HO-
OH
OH
OH
OH
NG
OH
€
+
Suppose the molecule in the drawing area below were reacted with H₂ over a platinum catalyst. Edit the molecule to show what would happen to it. That is, turn
it into the product of the reaction.
Also, write the name of the product molecule under the drawing area.
Name: ☐
H
C=0
X
H-
OH
HO-
H
HO-
-H
CH₂OH
×
Draw the Haworth projection of the disaccharide made by joining D-glucose and D-mannose with a ẞ(1-4) glycosidic bond. If the disaccharide has more than
one anomer, you can draw any of them.
Click and drag to start drawing a
structure.
X
Chapter 7 Solutions
Student Solutions Manual for Ebbing/Gammon's General Chemistry, 11th
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell